Physics Past Questions v35 for (JAMB/WAEC/NECO)

Physics Past Questions v35 For (JAMB/WAEC/NECO); These Physics past questions are for students who are sitting for the following examinations

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Physics Past Questions v35 For (JAMB/WAEC/NECO)

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#1. A radioactive substance has a half life of 20 days. What fraction of the original radioactive nuclei will remain after 80 days?

A) 1/32

A) 1/32

B) 1/16

B) 1/16

C) 1/8

C) 1/8

D) 1/4

D) 1/4

#2. A conductor has a diameter of 1.00mm and length of 2.00m. If the resistance of the material is 0.1Ω, the resistivity is

A) 2.55 * 105 Ωm

A) 2.55 * 105 Ωm

B) 2.55 * 103 Ωm

B) 2.55 * 103 Ωm

C) 3.93 * 10-6 Ωm

C) 3.93 * 10-6 Ωm

D) 3.93 * 10-8 Ωm

D) 3.93 * 10-8 Ωm

#3. The instrument that measures both ac and dc is called

A) A current balance

A) A current balance

B) a moving coil ammenter

B) a moving coil ammenter

C) a moving iron ammeter

C) a moving iron ammeter

D) an inverter

D) an inverter

#4. If two charged plates are maintained at a potential difference of 3 kv, the work done in taking a charge of 600µc across the field is

A) 0.8j

A) 0.8j

B) 1.8j

B) 1.8j

C) 9.0j

C) 9.0j

D) 18.0j

D) 18.0j

#5. An engine of a car of power 80 kW moves on a rough road with a velocity of 32 ms-1. The forces required to bring it to rest is

A) 2.56 x 106N

A) 2.56 x 106N

B) 2.50 x 106N

B) 2.50 x 106N

C) 2.80 x 103N

C) 2.80 x 103N

D) 2.50 x 103N

D) 2.50 x 103N

#6. A progressive wave equation is represented by y = a sin(150 πt - πx/4). if the phase difference of a progressive wave is 45°, the value of x in the equation is

A) 3 cm

A) 3 cm

B) 4 cm

B) 4 cm

C) 1 cm

C) 1 cm

D) 2 cm

D) 2 cm

#7. The frequency of the wave in the diagram above is

A) 0.17 Hz

A) 0.17 Hz

B) 0.25 Hz

B) 0.25 Hz

C) 1.57 Hz

C) 1.57 Hz

D) 1.05 Hz

D) 1.05 Hz

#8. In the diagram above, the pressure of the gas is

A) 86 cm of mercury

A) 86 cm of mercury

B) 66 cm of mercury

B) 66 cm of mercury

C) 96 cm of mercury

C) 96 cm of mercury

D) 76 cm mercury

D) 76 cm mercury

#9. A mirror of weight 75N is hung by a cord from a hook on the wall. If the cord makes an angle of 30o with horizontal, the tension in the cord is

A) 100N

A) 100N

B) 1500N

B) 1500N

C) 250N

C) 250N

D) 150N

D) 150N

#10. In a gas experiment, if the volume of the gas is plotted against the reciprocal of the pressure, the unit of the slope of the resulting curve is

A) force

A) force

B) temperature

B) temperature

C) power

C) power

D) work

D) work

#11. A shooter wants to fire a bullet in such a way that its horizontal range is equal to three times its maximum height. At the what angle should he fire the bullet to achieve this?

A) 68o

A) 68o

B) 53o

B) 53o

C) 30o

C) 30o

D) 45o

D) 45o

#12. The diagram above represents the stress-strain graph for a typical metal rod. What does the X represent?

A) Breaking point

A) Breaking point

B) Yield point

B) Yield point

C) Elastic limit

C) Elastic limit

D) Proportional limit

D) Proportional limit

#13. An object placed 10cm from a concave mirror of focal length 5cm would have its image

A) at the centre of convature

A) at the centre of convature

B) at the radius of curvature

B) at the radius of curvature

C) at infinity

C) at infinity

D) 10 cm from the focus

D) 10 cm from the focus

#14. A submarine is observed to rise from a real depth off 80 m to 60 m in water. calculate the change in apparent depth. [Refraction index of water (4)/3]

A) 45 m

A) 45 m

B) 80 m

B) 80 m

C) 15 m

C) 15 m

D) 60 m

D) 60 m

#15. Non-luminous object can be seen because they

A) reflect light

A) reflect light

B) are near

B) are near

C) are polished

C) are polished

D) emit light

D) emit light

#16. The wavelength of the first overtone of a note in a closed pipe of length 33 cm is?

A) 33 cm

A) 33 cm

B) 44 cm

B) 44 cm

C) 22 cm

C) 22 cm

D) 17 cm

D) 17 cm

#17. A person can focus objects when they lie beyond 75 cm from his eyes. The focal length of the lens required to reduce his least distance of distinct vision to 25 cm is?

A) 37.50 cm

A) 37.50 cm

B) 75.00 cm

B) 75.00 cm

C) 18.75

C) 18.75

D) 25.00 cm

D) 25.00 cm

#18. A radioactive element has a half life of 4 days. The fraction that has decayed in 16 days is?

A) (15)/16

A) (15)/16

B) (1)/16

B) (1)/16

C) (3)/4

C) (3)/4

D) (1)/4

D) (1)/4

#19. The theory of electronic conduction in solids, which satisfactorily explains the properties of conductors, insulators and semi-conductor,is?

A) string theory

A) string theory

B) particle theory

B) particle theory

C) group theory

C) group theory

D) band theory

D) band theory

#20. I. The number of neutrons released exceeds the number that caused the fission. II. There is loss of mass. III. Energy is produced. IV. Smaller nuclei merge to form larger nuclei Which of the statement above are correct about nuclear fission?

A) II,III and IV only

A) II,III and IV only

B) I, II and IV only

B) I, II and IV only

C) I,II and III only

C) I,II and III only

D) I, III and IV only

D) I, III and IV only

#21. A certain manufacturer wishes to make an n-type semiconductor. Which materials would he select for doping?

A) boron and antimony

A) boron and antimony

B) aluminium and antimony

B) aluminium and antimony

C) aluminium and indium

C) aluminium and indium

D) arsenic and antimony

D) arsenic and antimony

#22. A p-n junction diode is used as?

A) a rectifier in a d.c circuit

A) a rectifier in a d.c circuit

B) an amplifier in d.c circuit

B) an amplifier in d.c circuit

C) an anplifier in an a.c circuit

C) an anplifier in an a.c circuit

D) a rectifier in an a.c circuit

D) a rectifier in an a.c circuit

#23. I. Work done by load is always less than the work done by effort. II. All machines are made of levers, pulleys, screws and gear wheels. III. A fishing rod is a machine. Iv. Effort is always larger than load. which of statements above about machines are true?

A) I and III

A) I and III

B) III and IV

B) III and IV

C) I and III

C) I and III

D) II and III

D) II and III

#24. The energy associated with the emitted photon when a mercury atom changes from one state to another is 3.3 ev. calculate the frequency of the photon. [e = 1.6 x 10-19c; h = 6.6 x 10-13js]

A) 1.3 x 10-15 Hz

A) 1.3 x 10-15 Hz

B) 3.1 x 1052 Hz

B) 3.1 x 1052 Hz

C) 3.2 x 10-53 Hz

C) 3.2 x 10-53 Hz

D) 8.0 x 1014 Hz

D) 8.0 x 1014 Hz

#25. The process through which free electrons leave the surface of hot metal is known as?

A) photon emission

A) photon emission

B) photo emission

B) photo emission

C) thermionic emission

C) thermionic emission

D) electron emission

D) electron emission

#26. The battery connection that permits current to flow across a p-n junction is called?

A) reverse baised

A) reverse baised

B) forward baised

B) forward baised

C) amplification.

C) amplification.

D) rectification

D) rectification

#27. The motion of smoke particles from a chimney is typical of?

A) random motion

A) random motion

B) circular motion

B) circular motion

C) rotational motion

C) rotational motion

D) oscillatory motion

D) oscillatory motion

#28. In an experiment to determine terminal velocity, as the pressure increases, the viscosity off a liquid

A) increases

A) increases

B) decreases

B) decreases

C) increases then decreases

C) increases then decreases

D) remains constant

D) remains constant

#29. If the radius of the earth is 6.4 x 106m, the escape velocity of a satellite from the earth is? [g = 10 ms-2]

A) 1.13 x 104 ms-1

A) 1.13 x 104 ms-1

B) 9.00 x 103 ms-1

B) 9.00 x 103 ms-1

C) 8.00 x 103 ms-1

C) 8.00 x 103 ms-1

D) 1.27 x 104 ms-1

D) 1.27 x 104 ms-1

#30. The component of vector X along the direction of vector Y is zero when

A) X and Y are in opposite directions to each other

A) X and Y are in opposite directions to each other

B) X is at an angle of 45° to Y

B) X is at an angle of 45° to Y

C) X is perpendicular to Y

C) X is perpendicular to Y

D) X and Y are parallel to each other

D) X and Y are parallel to each other

#31. The correct unit of energy density is?

A) kg m3 s-2

A) kg m3 s-2

B) kg m2 s-2

B) kg m2 s-2

C) kg m-3 s-2

C) kg m-3 s-2

D) kg m-1 s-2

D) kg m-1 s-2

#32. When an a.c. voltage is applied to a capacitor, no power is consumed because the current

A) leads the voltage by 90°

A) leads the voltage by 90°

B) lags behind the voltage by 90°

B) lags behind the voltage by 90°

C) and voltage are in phase

C) and voltage are in phase

D) and voltage are 180° out of phase

D) and voltage are 180° out of phase

#33. The electrolyte in the Nickei-iron (Nife) accumulator is

A) potassium hydroxide solution

A) potassium hydroxide solution

B) dilute tetraoxosulphate(VI)acid

B) dilute tetraoxosulphate(VI)acid

C) copper tetraoxosulphate(VI)solution

C) copper tetraoxosulphate(VI)solution

D) ammonium chloride solution

D) ammonium chloride solution

#34. During electrolysis, 2.0 g of a metal is deposited using a current of 0.5 A in 3 hours. The mass of the same metal which can be deposited using a current of 1.5 A in 1 hour is?

A) 1.0 g

A) 1.0 g

B) 0.5 g

B) 0.5 g

C) 3.0 g

C) 3.0 g

D) 2.0 g

D) 2.0 g

#35. When a certain a.c supply is connected to a lamp, it lights with the same brightness as it does with a 12 V d.c battery. Then r.m.s value of the a.c supply is?

A) 12.0 V

A) 12.0 V

B) 3.5 V

B) 3.5 V

C) 17.0 V

C) 17.0 V

D) 8.5

D) 8.5

#36. An ammeter of resistance 5Ω has a full-scale deflection when a current of 50 mA flows in it. The value of the resistor required to adapt it to measure a current of 5 A is?

A) 0.25Ω

A) 0.25Ω

B) 5.00Ω

B) 5.00Ω

C) 19.80Ω

C) 19.80Ω

D) 0.05Ω

D) 0.05Ω

#37. A cell of internal resistance r is connected to an external resistor R. The conductor for maximum power transfer is?

A) R < r

A) R < r

B) R = r

B) R = r

C) R = 2r

C) R = 2r

D) R > r

D) R > r

#38. The production and type of charge of a body can only be accounted for by the?

A) deficiency or surplus of electrons

A) deficiency or surplus of electrons

B) equibrium in protons and neutrons

B) equibrium in protons and neutrons

C) deficiency or surplus of protrons

C) deficiency or surplus of protrons

D) deficiency or surplus of neutrons

D) deficiency or surplus of neutrons

#39. The main purpose of the transformer in an a.c radio set is to?

A) increase power to the radio

A) increase power to the radio

B) step up the voltage

B) step up the voltage

C) convert energy from a.c to d.c

C) convert energy from a.c to d.c

D) step down the voltage

D) step down the voltage

#40. An electric heater with a p.d of 240 V connected across its terminals has a total resistance of 960Ω. find the power rating of the heater.

A) 0.25 W

A) 0.25 W

B) 4.00 W

B) 4.00 W

C) 38.40W

C) 38.40W

D) 60.00W

D) 60.00W

#41. If the capacitance of an capacitor is C = (εA)/d, which of the following parameters is varied when a variable capacitors is used for tuning radio sets?

A) constant (ε) and area

A) constant (ε) and area

B) area and distance.

B) area and distance.

C) constant (ε) only

C) constant (ε) only

D) distance only

D) distance only

#42. The thermometric property of a constant volume thermometer is?

A) change in volume

A) change in volume

B) differential expanssion

B) differential expanssion

C) change in pressure

C) change in pressure

D) change in length

D) change in length

#43. An immersion heater rated 2.0A, 240V is used to boil water from temperature 52°c to 100°c. If the mass of the water is 2.5kg. determine the time taken to boil the water. [specific heat capacity of water = 4.2 x 103 jkg-1 k-1]

A) 1.05 x 103s

A) 1.05 x 103s

B) 1.05 x 105s

B) 1.05 x 105s

C) 1.05 x 102s

C) 1.05 x 102s

D) 1.05 x 104s

D) 1.05 x 104s

#44. The thermos flask is designed to?

A) prevent heat loss or gain by conduction, convection amd radiation

A) prevent heat loss or gain by conduction, convection amd radiation

B) store hot tea or water

B) store hot tea or water

C) prevent heat gain by conduction, convection and radiation

C) prevent heat gain by conduction, convection and radiation

D) prevent head lost conduction, convention and radiation

D) prevent head lost conduction, convention and radiation

#45. what is likely to happen if the glass of a thermometer expands more upon heating than the liquid inside?

A) the glass will break

A) the glass will break

B) the glass will shrink

B) the glass will shrink

C) the liquid will rise up in the stem

C) the liquid will rise up in the stem

D) the liquid will go down in the stem

D) the liquid will go down in the stem

#46. A drop of petrol makes a finger colder than a drop of water would because?

A) petrol takes its latent heat of veporization from the finger

A) petrol takes its latent heat of veporization from the finger

B) petrol takes its latent heat of fusion from the finger

B) petrol takes its latent heat of fusion from the finger

C) water is more viscious than petrol

C) water is more viscious than petrol

D) water has higher surface tension dan petrol

D) water has higher surface tension dan petrol

#47. A uniform solid cube material 10cm on each side of mass 700g is submerged in water. which of the following best described the behavior of the cube water?

A) the cube will melt after a period of time

A) the cube will melt after a period of time

B) the cube will float

B) the cube will float

C) the cube will sink in water

C) the cube will sink in water

D) the cube will rest at an equilibrium position in water

D) the cube will rest at an equilibrium position in water

#48. At low humidity in an environment, the human skin is usually?

A) damp and rough

A) damp and rough

B) damp and smooth

B) damp and smooth

C) dry and rough

C) dry and rough

D) dry and smooth

D) dry and smooth

#49. If the relative density of gold is 19.2, the volume of 2.4kg of gold is?

A) 8.00 x 10-3 m3

A) 8.00 x 10-3 m3

B) 1.25 x 10-4 m3

B) 1.25 x 10-4 m3

C) 1.92 x 10-4 m3

C) 1.92 x 10-4 m3

D) 4.61 x 10-3 m3

D) 4.61 x 10-3 m3

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